We are VERY NEW to rabbits. My DD has 2 5mo old mini rex rabbits. We have had them since the middle of Sept. The buck has stopped eating. DD gives 1/2 c pellets once a day and she has not given any food for several days. We had a food change when we got him and he ate just fine. Yesterday, we switched back to the food he was eating at his last home. DD gave him just a little oatmeal to entice him. What do we do now? He's drinking and using his litter box, although not as much as he was. He's bright eyed and his coat looks good. What else should we be watching for?